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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e84a80b998e9c6b3086cc929d3b3446d91ca5df0d415542aa588cbd38fdd4ca' 
  AND token = 'y6iyqH7sg5FqPmE99D4g3+avXztkohFeExu8a9AkExM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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