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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff5326018c9fb3d8f38838bd47396df876f7a7bcb5b31ff18e5db1d5a42461b9' 
  AND token = 'Wm5MH9wnEqkAv3NPAqF1KCjYVpFnweoCA8EfQkSu8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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