SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a94049d31f4052d66d1e73533a662419f0690ad774587eeb182042561cb5455' 
  AND token = 'vhV/No3uPsvEY6+k/j8HQynogoeCp+rpU1N1qcdkVxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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