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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c584db9278c9a1ad166b7892c24101cea128471767086053df3bc0139805193' 
  AND token = 'piiDpz7Y3VCiV/KFC6ZW5zMtan/Lrb0zcUr02FZ9K3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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