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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a0a53ee99c690a9c1379bbd375418c9aaa6d4714ba4836132540730503179e2' 
  AND token = '3mTpugE1TukVi+pnKMZdHgzSEiRkTtb6jdR3IKvCsyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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