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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dbf8f4dddc67d1d7a7b8fef7a01b8eec38320db8386c98ac5d6e3a69ece1e91' 
  AND token = 'YJFumaTOyKXN8TFG9QxuIsofsLxGoA/FXgo1FbdbF7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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