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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b76c34191b1c27fa499cf1e656ad39ec14ba7a61281c4891711568171d06c8cd' 
  AND token = 'Wg/y0TsGgSc+o3LBSDUaIbDj8KiRclvS5har+9e0Qi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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