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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e985f05495cb02d10b8a0e6956f23bec6ddb765205f6f90199b4a8110e42a4f4' 
  AND token = 'UXycTV7ZWyh18RTmWxU9jXxU1BqcjPxILqDECnFybMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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