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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d1889721cda7fd06afd861a81e0de57afef28318318c3c854c40920e1d41df3' 
  AND token = 'QrPezeScLhUDwNzFYAS3GTzoHXj3RQCX8TdaqD3AMU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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