SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bc121c18d97f912cbd0771803b45764b836e22d1a2f8e9f5d8c500df10f2cbf' 
  AND token = 'YZSZornJjuYh8+Kh5pmvBK4dwegBqtz+3QWhzfFUwOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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