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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a419c5f229c9194479be1d72a95279b8364cc59459b1d593b4197fc8af91b1e6' 
  AND token = 'E4Ve41Vyp8eYRafccXDILV5Sul0L0QhcZa5bnZFwUd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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