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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04e7a50658e055e9e17a958ec1960de2fc1003ccf26a84a791f353fc8a00c56b' 
  AND token = 'Th5wiooC7C8WF8IU4fT0QN/6q3nvtPWHK/Z/4x7y8xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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