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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab414ee3a18629db7bdc7d3357b5ef3803edb4c5d30a9d6452194186f600e42f' 
  AND token = '0wJQc1V+2MD9Ac8VE/ZbFRM1OkW1v/kTIDr9cBDfCak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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