SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8786107c16bc175aaf0e5ea6c37ee698bf2c274c6e8774e369a8669c64183a7f' 
  AND token = 'VSFke00PF155wegKxNgw+Uj6xRJFz0Gv5H/bBEsGGX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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