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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e08c5aa84600b21cd523b95339e64846720a1ac40813a457421b5b74cffd9fbf' 
  AND token = 'fw3O/9JySF5AJP+19a96Ke5FLEUchQo7eWyb1SuIQeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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