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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f3471c604cf3e7633900a7cf7904ea3651aa031df6ca34905b77dc582126945' 
  AND token = 'L93Qz43B85knE+efbijUPf4/o8QvOB3ZfrK2GzbBT88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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