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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2289cdb53596dc9db340b6813f4c8500bab690b4c086fd0650364fd3086554d5' 
  AND token = 'i3f1RTQ2QKZxbP2Cz4dCwpQG3s9RRxjdhq7wG8IxKoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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