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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17a39b4467e99f59f005df6d05dba0f3fa00e7c35cd0faecc24c9e40a60cbad3' 
  AND token = 'tHwI9ndbOaNYGNBD4jdPXA+/zlOL6vHq1PNpqK33/iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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