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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6913fcf22bbf42a962bba9beaf48fa5d636bb4dde011d5efad2ca45e53a29c1f' 
  AND token = '8pqpL8BKwrFOW2KYsuiqZhykqPt+hZjT3cqrWO155SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}