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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19308f7ad6d786d7ec92ab771c25bc911bcd5fbaeba8ec15c62c319be3aa2887' 
  AND token = 'fpX1GxKIV+nH/HWLH3+HivGOeCJP9nyddyVTblX0VD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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