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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a651a5440468f52ef877ea0788154d7e60ccf8dcb653d3cbc3eff2d0e40bea5a' 
  AND token = 'hxhbMzryXxZgwLFRKMafcMYeFFR1sZDKj0D7bH2Svcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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