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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3c0c13eb86260dfe1585ff7eec7a9f0398b591292a080bbd455f87eff595ab2' 
  AND token = 'NBQo09ubgYj7Iqj1BToAkHYyw2eVl4hxcC03gxCImm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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