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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ceae7e9b3fcb5388a8e67cfca43ec563876336f4231b858bc64fb412a45aeed' 
  AND token = 'FzitQvsKpADJFkC80nlr6POikTUc+jIXFNEDeZjC97k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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