SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f950981dc75315e73a1c38483f4e75f4fe4f73b747d7f3ef4a3a72869b1d0266' 
  AND token = '/trDLVP3CtluhuR+GSBRocWxEv/QtN6/RDbWph12K+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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