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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48831b77720d1594db5edd556e96e943dade4a962f4450ea463ce71c60092450' 
  AND token = '5XUFSprLl9XXxCcUfg5fQknZ6uIJnV5Do7+NYXm4nc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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