SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '135af543b78981d7bb457ca16b941a5f17ad1d2db3ce361901517b4236c7b941' 
  AND token = 'ArKNpXe2gwZp1Mpv1G+Bszxh54joZwMXX0GRBLAMtIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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