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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '935a33eb168a8596968dcb67c9405a35801d6fad69e809bb15470abba802cec7' 
  AND token = '5vL/l4JJ/zJrVcGQlVUB2EtZ2Srct3BDkN1ZbAxNIa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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