SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fcea95e25c1a0817c41efd54df46c61958deefb14e865242c9712d4334ab7fd' 
  AND token = '463+2LwFkV4i9fbD+CrQrRKqfYGAG0E/FGm+jKJ62V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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