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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c74133fa387ef2688e7857dd5d8935683a943549542271dea88e824ddbb4f41' 
  AND token = 'fwTsWP4iaowzIri8BV0m82wEgQTsv4GiyFtrPat43gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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