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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9999d625b70e7d45a49fac4140cb656f96d874d84da2bd6a4950e2dbc55df2b' 
  AND token = 'LYqwcBhFSKylIMFlZzFFNRi5tBoyixiyNGREExEu+Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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