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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f1651eb6e4913554d19c3420798716efbd909da3b0cdaf7d0e38c89e8ed013c' 
  AND token = 'Fkv3M3m4Hii+gseH6/JMUS6xGry9SNavXzyjmYTZiLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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