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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c7f1420bf4daf9391a6da84776270163f0ed17c11321171b35613270d7685d' 
  AND token = 'JCWlvK3tl6h2HXLi4bstapX/uQADKbNr3qCZ5mzCeCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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