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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06b77911e09d72988efecb7bc7c434aebec83fb79c3b2cb7d7838a8955d17e63' 
  AND token = 'nylQduIYzvXkRtarlTLI6aui74sGkZt9f31Vs3u7yT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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