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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cc5eb8d827e52ac353bfab16f836e420e44c3c5962d5c9cf28ab6566d8d590b' 
  AND token = 'zDquuV2EtG59D5Zy4O9al0MgyGU3hhMi0z1FmL/1VAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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