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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3695c4ac556650ba14e71c8b4bca6a56332b938125efa2360cfdac4f718cbdb' 
  AND token = '+IPfUDGYfNPrH7HyRUyIFAUbIdeYrsqiJZolSa7gAE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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