SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1be5790fa109143f8f9d7881d615f7ed904f6a00ac5e31906a8ee64f72fc3d55' 
  AND token = 'vxUMP/uy1Grqjy5X9YDzWIjOmnwJ3qhacU93d2p7Rwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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