SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc3c64f3949429a6af886b2724d6fb468c8a82ba9332cc17654873bb61fd533c' 
  AND token = '4K1+p7+qAShKLC9kGm4+EfmcHXxmngWb+JB2oRDGyJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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