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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4707f98e9176b961cfba5378e8a4499e8330766f6705323f494d787480bbccc4' 
  AND token = '95vWMniMzqM9wbC7uFmWgXn5FiSKjkBxz7lHs66h81A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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