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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11abb2e054bbaf8a1abf62e960d83170d8121308593f64f7de44d0ae64e57034' 
  AND token = '8TJnp4OiEx6Zo7n0UOaHgK9zN8cfGDkgAasPIWlGHyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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