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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a844327c7012c9aefc72dbb34c77aca6da8d1157edd7cb89d945f2e4923a1a6' 
  AND token = 'bueDrVcjFXFp5Tk02GGoPh3dpX2OR9AIVGiWxyVD2Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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