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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aca8c83a77cb500b0b53e938468e4367d8f2d00444f4284da76bb66b463e1b4d' 
  AND token = 'sVxMQRVOCUoHfJTzlbFQ1T4jWErLPEsPle4tNcf2EAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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