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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c73135130f5a492e7f6015625ba41e1e814bc0bfd0ef7d8123ccd035afadac9' 
  AND token = '46b6TiYChQUYK3vghNDD6nedTbqo4SSJa/bcPDhgRcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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