SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8896e7c8dd22867b9ff790d1f84fb1955df3130433d435540468115c24eb302e' 
  AND token = 'fvyxypzHVW/OBQfLxCzCRqnkF0gS6acwBINvCNq+8nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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