SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ac9b8b103f0ce22443e1c2692445f5c3fb4e6c43405f25519416249893968de' 
  AND token = 'nfp4YiSt6V7HSP9ZIRvQ8K9vvc2guFJHqS0KDGx5iGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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