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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2797443701ad5cc053194ebc07351f94e63d9e4502a09ab8f211d56227225ec7' 
  AND token = 'uuXg/CFQEGRRiC/dtrcu+73vHr+z3ZH6UpQ13SUishQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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