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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f372f609058efc5c2dd4e91aee8eb28b9e0a2aa0e1ac022738c0baa6261474d' 
  AND token = 'puXBwqV2YtcYIQNOftpb6FU9BQP2is7xQaCHKlPJpX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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