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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63bf729e7e9fa72bf8576d9a66b65af831dc0aa4c72e5501a75fc898ab150647' 
  AND token = 'VZfPFwjAF1dqp55uVzeB926EyKulSMqAczaombttamI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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