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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cb31723f884e1de835dba55dd38e57020872982b305d3e9b31afcd6e2a31a87' 
  AND token = 'SK+hd+RqfR9F/O920TErol7iHHtp+pRY7t17gt5T9FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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