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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8966bb82a4bd970ffda6d36bcfe49db26c542025e9306abfc6732c229072668' 
  AND token = 'XcQRLPznafAnc5FkjS+Z1kf5z93VmI9mGkyLyOKl+lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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