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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a13dda27f7b4502c4276801a7e666015f12b2046786051c6cd4558cf6ffe251' 
  AND token = 'TZ6xIyLhAqoI8L3X8m4fgKDpgLJ0sGe6CU0spvAP0jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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