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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3daf9638e517030b764d3773345bab6ce9995956430db04885ad6598742d32b4' 
  AND token = 'lD1SGu9L2QUicyHoX4X2ovLmZ4h2d7TtObMx8b8yJR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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