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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aab4f2cb6525d426865fa50f689766a29ab1e34cbf3bb5eb706805f01cbc2d38' 
  AND token = 'sTv6xsbvN7Htpsl0NovVloOLufyk8CJ6f+m2HfKaM0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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